1 //===-- StringPrinter.cpp ----------------------------------------*- C++
4 // The LLVM Compiler Infrastructure
6 // This file is distributed under the University of Illinois Open Source
7 // License. See LICENSE.TXT for details.
9 //===----------------------------------------------------------------------===//
11 #include "lldb/DataFormatters/StringPrinter.h"
13 #include "lldb/Core/Debugger.h"
14 #include "lldb/Core/ValueObject.h"
15 #include "lldb/Target/Language.h"
16 #include "lldb/Target/Process.h"
17 #include "lldb/Target/Target.h"
18 #include "lldb/Utility/Status.h"
20 #include "llvm/Support/ConvertUTF.h"
26 using namespace lldb_private;
27 using namespace lldb_private::formatters;
29 // we define this for all values of type but only implement it for those we care
31 // that's good because we get linker errors for any unsupported type
32 template <lldb_private::formatters::StringPrinter::StringElementType type>
33 static StringPrinter::StringPrinterBufferPointer<>
34 GetPrintableImpl(uint8_t *buffer, uint8_t *buffer_end, uint8_t *&next);
36 // mimic isprint() for Unicode codepoints
37 static bool isprint(char32_t codepoint) {
38 if (codepoint <= 0x1F || codepoint == 0x7F) // C0
42 if (codepoint >= 0x80 && codepoint <= 0x9F) // C1
46 if (codepoint == 0x2028 || codepoint == 0x2029) // line/paragraph separators
50 if (codepoint == 0x200E || codepoint == 0x200F ||
51 (codepoint >= 0x202A &&
52 codepoint <= 0x202E)) // bidirectional text control
56 if (codepoint >= 0xFFF9 &&
57 codepoint <= 0xFFFF) // interlinears and generally specials
65 StringPrinter::StringPrinterBufferPointer<>
66 GetPrintableImpl<StringPrinter::StringElementType::ASCII>(uint8_t *buffer,
69 StringPrinter::StringPrinterBufferPointer<> retval = {nullptr};
100 retval = {"\\\\", 2};
103 if (isprint(*buffer))
104 retval = {buffer, 1};
106 uint8_t *data = new uint8_t[5];
107 sprintf((char *)data, "\\x%02x", *buffer);
108 retval = {data, 4, [](const uint8_t *c) { delete[] c; }};
117 static char32_t ConvertUTF8ToCodePoint(unsigned char c0, unsigned char c1) {
118 return (c0 - 192) * 64 + (c1 - 128);
120 static char32_t ConvertUTF8ToCodePoint(unsigned char c0, unsigned char c1,
122 return (c0 - 224) * 4096 + (c1 - 128) * 64 + (c2 - 128);
124 static char32_t ConvertUTF8ToCodePoint(unsigned char c0, unsigned char c1,
125 unsigned char c2, unsigned char c3) {
126 return (c0 - 240) * 262144 + (c2 - 128) * 4096 + (c2 - 128) * 64 + (c3 - 128);
130 StringPrinter::StringPrinterBufferPointer<>
131 GetPrintableImpl<StringPrinter::StringElementType::UTF8>(uint8_t *buffer,
134 StringPrinter::StringPrinterBufferPointer<> retval{nullptr};
136 unsigned utf8_encoded_len = llvm::getNumBytesForUTF8(*buffer);
138 if (1u + std::distance(buffer, buffer_end) < utf8_encoded_len) {
139 // I don't have enough bytes - print whatever I have left
140 retval = {buffer, static_cast<size_t>(1 + buffer_end - buffer)};
141 next = buffer_end + 1;
145 char32_t codepoint = 0;
146 switch (utf8_encoded_len) {
148 // this is just an ASCII byte - ask ASCII
149 return GetPrintableImpl<StringPrinter::StringElementType::ASCII>(
150 buffer, buffer_end, next);
152 codepoint = ConvertUTF8ToCodePoint((unsigned char)*buffer,
153 (unsigned char)*(buffer + 1));
156 codepoint = ConvertUTF8ToCodePoint((unsigned char)*buffer,
157 (unsigned char)*(buffer + 1),
158 (unsigned char)*(buffer + 2));
161 codepoint = ConvertUTF8ToCodePoint(
162 (unsigned char)*buffer, (unsigned char)*(buffer + 1),
163 (unsigned char)*(buffer + 2), (unsigned char)*(buffer + 3));
166 // this is probably some bogus non-character thing
167 // just print it as-is and hope to sync up again soon
168 retval = {buffer, 1};
200 retval = {"\\\"", 2};
203 retval = {"\\\\", 2};
206 if (isprint(codepoint))
207 retval = {buffer, utf8_encoded_len};
209 uint8_t *data = new uint8_t[11];
210 sprintf((char *)data, "\\U%08x", (unsigned)codepoint);
211 retval = {data, 10, [](const uint8_t *c) { delete[] c; }};
216 next = buffer + utf8_encoded_len;
220 // this should not happen - but just in case.. try to resync at some point
221 retval = {buffer, 1};
226 // Given a sequence of bytes, this function returns:
227 // a sequence of bytes to actually print out + a length
228 // the following unscanned position of the buffer is in next
229 static StringPrinter::StringPrinterBufferPointer<>
230 GetPrintable(StringPrinter::StringElementType type, uint8_t *buffer,
231 uint8_t *buffer_end, uint8_t *&next) {
236 case StringPrinter::StringElementType::ASCII:
237 return GetPrintableImpl<StringPrinter::StringElementType::ASCII>(
238 buffer, buffer_end, next);
239 case StringPrinter::StringElementType::UTF8:
240 return GetPrintableImpl<StringPrinter::StringElementType::UTF8>(
241 buffer, buffer_end, next);
247 StringPrinter::EscapingHelper
248 StringPrinter::GetDefaultEscapingHelper(GetPrintableElementType elem_type) {
250 case GetPrintableElementType::UTF8:
251 return [](uint8_t *buffer, uint8_t *buffer_end,
252 uint8_t *&next) -> StringPrinter::StringPrinterBufferPointer<> {
253 return GetPrintable(StringPrinter::StringElementType::UTF8, buffer,
256 case GetPrintableElementType::ASCII:
257 return [](uint8_t *buffer, uint8_t *buffer_end,
258 uint8_t *&next) -> StringPrinter::StringPrinterBufferPointer<> {
259 return GetPrintable(StringPrinter::StringElementType::ASCII, buffer,
263 llvm_unreachable("bad element type");
266 // use this call if you already have an LLDB-side buffer for the data
267 template <typename SourceDataType>
268 static bool DumpUTFBufferToStream(
269 llvm::ConversionResult (*ConvertFunction)(const SourceDataType **,
270 const SourceDataType *,
271 llvm::UTF8 **, llvm::UTF8 *,
272 llvm::ConversionFlags),
273 const StringPrinter::ReadBufferAndDumpToStreamOptions &dump_options) {
274 Stream &stream(*dump_options.GetStream());
275 if (dump_options.GetPrefixToken() != 0)
276 stream.Printf("%s", dump_options.GetPrefixToken());
277 if (dump_options.GetQuote() != 0)
278 stream.Printf("%c", dump_options.GetQuote());
279 auto data(dump_options.GetData());
280 auto source_size(dump_options.GetSourceSize());
281 if (data.GetByteSize() && data.GetDataStart() && data.GetDataEnd()) {
282 const int bufferSPSize = data.GetByteSize();
283 if (dump_options.GetSourceSize() == 0) {
284 const int origin_encoding = 8 * sizeof(SourceDataType);
285 source_size = bufferSPSize / (origin_encoding / 4);
288 const SourceDataType *data_ptr =
289 (const SourceDataType *)data.GetDataStart();
290 const SourceDataType *data_end_ptr = data_ptr + source_size;
292 const bool zero_is_terminator = dump_options.GetBinaryZeroIsTerminator();
294 if (zero_is_terminator) {
295 while (data_ptr < data_end_ptr) {
297 data_end_ptr = data_ptr;
303 data_ptr = (const SourceDataType *)data.GetDataStart();
306 lldb::DataBufferSP utf8_data_buffer_sp;
307 llvm::UTF8 *utf8_data_ptr = nullptr;
308 llvm::UTF8 *utf8_data_end_ptr = nullptr;
310 if (ConvertFunction) {
311 utf8_data_buffer_sp.reset(new DataBufferHeap(4 * bufferSPSize, 0));
312 utf8_data_ptr = (llvm::UTF8 *)utf8_data_buffer_sp->GetBytes();
313 utf8_data_end_ptr = utf8_data_ptr + utf8_data_buffer_sp->GetByteSize();
314 ConvertFunction(&data_ptr, data_end_ptr, &utf8_data_ptr,
315 utf8_data_end_ptr, llvm::lenientConversion);
316 if (false == zero_is_terminator)
317 utf8_data_end_ptr = utf8_data_ptr;
318 // needed because the ConvertFunction will change the value of the
321 (llvm::UTF8 *)utf8_data_buffer_sp->GetBytes();
323 // just copy the pointers - the cast is necessary to make the compiler
325 // but this should only happen if we are reading UTF8 data
326 utf8_data_ptr = const_cast<llvm::UTF8 *>(
327 reinterpret_cast<const llvm::UTF8 *>(data_ptr));
328 utf8_data_end_ptr = const_cast<llvm::UTF8 *>(
329 reinterpret_cast<const llvm::UTF8 *>(data_end_ptr));
332 const bool escape_non_printables = dump_options.GetEscapeNonPrintables();
333 lldb_private::formatters::StringPrinter::EscapingHelper escaping_callback;
334 if (escape_non_printables) {
335 if (Language *language = Language::FindPlugin(dump_options.GetLanguage()))
336 escaping_callback = language->GetStringPrinterEscapingHelper(
337 lldb_private::formatters::StringPrinter::GetPrintableElementType::
341 lldb_private::formatters::StringPrinter::GetDefaultEscapingHelper(
342 lldb_private::formatters::StringPrinter::
343 GetPrintableElementType::UTF8);
346 // since we tend to accept partial data (and even partially malformed data)
347 // we might end up with no NULL terminator before the end_ptr
348 // hence we need to take a slower route and ensure we stay within boundaries
349 for (; utf8_data_ptr < utf8_data_end_ptr;) {
350 if (zero_is_terminator && !*utf8_data_ptr)
353 if (escape_non_printables) {
354 uint8_t *next_data = nullptr;
356 escaping_callback(utf8_data_ptr, utf8_data_end_ptr, next_data);
357 auto printable_bytes = printable.GetBytes();
358 auto printable_size = printable.GetSize();
359 if (!printable_bytes || !next_data) {
360 // GetPrintable() failed on us - print one byte in a desperate resync
362 printable_bytes = utf8_data_ptr;
364 next_data = utf8_data_ptr + 1;
366 for (unsigned c = 0; c < printable_size; c++)
367 stream.Printf("%c", *(printable_bytes + c));
368 utf8_data_ptr = (uint8_t *)next_data;
370 stream.Printf("%c", *utf8_data_ptr);
375 if (dump_options.GetQuote() != 0)
376 stream.Printf("%c", dump_options.GetQuote());
377 if (dump_options.GetSuffixToken() != 0)
378 stream.Printf("%s", dump_options.GetSuffixToken());
379 if (dump_options.GetIsTruncated())
380 stream.Printf("...");
384 lldb_private::formatters::StringPrinter::ReadStringAndDumpToStreamOptions::
385 ReadStringAndDumpToStreamOptions(ValueObject &valobj)
386 : ReadStringAndDumpToStreamOptions() {
387 SetEscapeNonPrintables(
388 valobj.GetTargetSP()->GetDebugger().GetEscapeNonPrintables());
391 lldb_private::formatters::StringPrinter::ReadBufferAndDumpToStreamOptions::
392 ReadBufferAndDumpToStreamOptions(ValueObject &valobj)
393 : ReadBufferAndDumpToStreamOptions() {
394 SetEscapeNonPrintables(
395 valobj.GetTargetSP()->GetDebugger().GetEscapeNonPrintables());
398 lldb_private::formatters::StringPrinter::ReadBufferAndDumpToStreamOptions::
399 ReadBufferAndDumpToStreamOptions(
400 const ReadStringAndDumpToStreamOptions &options)
401 : ReadBufferAndDumpToStreamOptions() {
402 SetStream(options.GetStream());
403 SetPrefixToken(options.GetPrefixToken());
404 SetSuffixToken(options.GetSuffixToken());
405 SetQuote(options.GetQuote());
406 SetEscapeNonPrintables(options.GetEscapeNonPrintables());
407 SetBinaryZeroIsTerminator(options.GetBinaryZeroIsTerminator());
408 SetLanguage(options.GetLanguage());
411 namespace lldb_private {
413 namespace formatters {
416 bool StringPrinter::ReadStringAndDumpToStream<
417 StringPrinter::StringElementType::ASCII>(
418 const ReadStringAndDumpToStreamOptions &options) {
419 assert(options.GetStream() && "need a Stream to print the string to");
422 ProcessSP process_sp(options.GetProcessSP());
424 if (process_sp.get() == nullptr || options.GetLocation() == 0)
428 const auto max_size = process_sp->GetTarget().GetMaximumSizeOfStringSummary();
429 bool is_truncated = false;
431 if (options.GetSourceSize() == 0)
433 else if (!options.GetIgnoreMaxLength()) {
434 size = options.GetSourceSize();
435 if (size > max_size) {
440 size = options.GetSourceSize();
442 lldb::DataBufferSP buffer_sp(new DataBufferHeap(size, 0));
444 process_sp->ReadCStringFromMemory(
445 options.GetLocation(), (char *)buffer_sp->GetBytes(), size, my_error);
450 const char *prefix_token = options.GetPrefixToken();
451 char quote = options.GetQuote();
453 if (prefix_token != 0)
454 options.GetStream()->Printf("%s%c", prefix_token, quote);
456 options.GetStream()->Printf("%c", quote);
458 uint8_t *data_end = buffer_sp->GetBytes() + buffer_sp->GetByteSize();
460 const bool escape_non_printables = options.GetEscapeNonPrintables();
461 lldb_private::formatters::StringPrinter::EscapingHelper escaping_callback;
462 if (escape_non_printables) {
463 if (Language *language = Language::FindPlugin(options.GetLanguage()))
464 escaping_callback = language->GetStringPrinterEscapingHelper(
465 lldb_private::formatters::StringPrinter::GetPrintableElementType::
469 lldb_private::formatters::StringPrinter::GetDefaultEscapingHelper(
470 lldb_private::formatters::StringPrinter::GetPrintableElementType::
474 // since we tend to accept partial data (and even partially malformed data)
475 // we might end up with no NULL terminator before the end_ptr
476 // hence we need to take a slower route and ensure we stay within boundaries
477 for (uint8_t *data = buffer_sp->GetBytes(); *data && (data < data_end);) {
478 if (escape_non_printables) {
479 uint8_t *next_data = nullptr;
480 auto printable = escaping_callback(data, data_end, next_data);
481 auto printable_bytes = printable.GetBytes();
482 auto printable_size = printable.GetSize();
483 if (!printable_bytes || !next_data) {
484 // GetPrintable() failed on us - print one byte in a desperate resync
486 printable_bytes = data;
488 next_data = data + 1;
490 for (unsigned c = 0; c < printable_size; c++)
491 options.GetStream()->Printf("%c", *(printable_bytes + c));
492 data = (uint8_t *)next_data;
494 options.GetStream()->Printf("%c", *data);
499 const char *suffix_token = options.GetSuffixToken();
501 if (suffix_token != 0)
502 options.GetStream()->Printf("%c%s", quote, suffix_token);
504 options.GetStream()->Printf("%c", quote);
507 options.GetStream()->Printf("...");
512 template <typename SourceDataType>
513 static bool ReadUTFBufferAndDumpToStream(
514 const StringPrinter::ReadStringAndDumpToStreamOptions &options,
515 llvm::ConversionResult (*ConvertFunction)(const SourceDataType **,
516 const SourceDataType *,
517 llvm::UTF8 **, llvm::UTF8 *,
518 llvm::ConversionFlags)) {
519 assert(options.GetStream() && "need a Stream to print the string to");
521 if (options.GetLocation() == 0 ||
522 options.GetLocation() == LLDB_INVALID_ADDRESS)
525 lldb::ProcessSP process_sp(options.GetProcessSP());
530 const int type_width = sizeof(SourceDataType);
531 const int origin_encoding = 8 * type_width;
532 if (origin_encoding != 8 && origin_encoding != 16 && origin_encoding != 32)
534 // if not UTF8, I need a conversion function to return proper UTF8
535 if (origin_encoding != 8 && !ConvertFunction)
538 if (!options.GetStream())
541 uint32_t sourceSize = options.GetSourceSize();
542 bool needs_zero_terminator = options.GetNeedsZeroTermination();
544 bool is_truncated = false;
545 const auto max_size = process_sp->GetTarget().GetMaximumSizeOfStringSummary();
548 sourceSize = max_size;
549 needs_zero_terminator = true;
550 } else if (!options.GetIgnoreMaxLength()) {
551 if (sourceSize > max_size) {
552 sourceSize = max_size;
557 const int bufferSPSize = sourceSize * type_width;
559 lldb::DataBufferSP buffer_sp(new DataBufferHeap(bufferSPSize, 0));
561 if (!buffer_sp->GetBytes())
565 char *buffer = reinterpret_cast<char *>(buffer_sp->GetBytes());
567 if (needs_zero_terminator)
568 process_sp->ReadStringFromMemory(options.GetLocation(), buffer,
569 bufferSPSize, error, type_width);
571 process_sp->ReadMemoryFromInferior(options.GetLocation(),
572 (char *)buffer_sp->GetBytes(),
573 bufferSPSize, error);
576 options.GetStream()->Printf("unable to read data");
580 DataExtractor data(buffer_sp, process_sp->GetByteOrder(),
581 process_sp->GetAddressByteSize());
583 StringPrinter::ReadBufferAndDumpToStreamOptions dump_options(options);
584 dump_options.SetData(data);
585 dump_options.SetSourceSize(sourceSize);
586 dump_options.SetIsTruncated(is_truncated);
588 return DumpUTFBufferToStream(ConvertFunction, dump_options);
592 bool StringPrinter::ReadStringAndDumpToStream<
593 StringPrinter::StringElementType::UTF8>(
594 const ReadStringAndDumpToStreamOptions &options) {
595 return ReadUTFBufferAndDumpToStream<llvm::UTF8>(options, nullptr);
599 bool StringPrinter::ReadStringAndDumpToStream<
600 StringPrinter::StringElementType::UTF16>(
601 const ReadStringAndDumpToStreamOptions &options) {
602 return ReadUTFBufferAndDumpToStream<llvm::UTF16>(options,
603 llvm::ConvertUTF16toUTF8);
607 bool StringPrinter::ReadStringAndDumpToStream<
608 StringPrinter::StringElementType::UTF32>(
609 const ReadStringAndDumpToStreamOptions &options) {
610 return ReadUTFBufferAndDumpToStream<llvm::UTF32>(options,
611 llvm::ConvertUTF32toUTF8);
615 bool StringPrinter::ReadBufferAndDumpToStream<
616 StringPrinter::StringElementType::UTF8>(
617 const ReadBufferAndDumpToStreamOptions &options) {
618 assert(options.GetStream() && "need a Stream to print the string to");
620 return DumpUTFBufferToStream<llvm::UTF8>(nullptr, options);
624 bool StringPrinter::ReadBufferAndDumpToStream<
625 StringPrinter::StringElementType::ASCII>(
626 const ReadBufferAndDumpToStreamOptions &options) {
627 // treat ASCII the same as UTF8
628 // FIXME: can we optimize ASCII some more?
629 return ReadBufferAndDumpToStream<StringElementType::UTF8>(options);
633 bool StringPrinter::ReadBufferAndDumpToStream<
634 StringPrinter::StringElementType::UTF16>(
635 const ReadBufferAndDumpToStreamOptions &options) {
636 assert(options.GetStream() && "need a Stream to print the string to");
638 return DumpUTFBufferToStream(llvm::ConvertUTF16toUTF8, options);
642 bool StringPrinter::ReadBufferAndDumpToStream<
643 StringPrinter::StringElementType::UTF32>(
644 const ReadBufferAndDumpToStreamOptions &options) {
645 assert(options.GetStream() && "need a Stream to print the string to");
647 return DumpUTFBufferToStream(llvm::ConvertUTF32toUTF8, options);
650 } // namespace formatters
652 } // namespace lldb_private